Cost-Aware Design: Making Mechanics Actionable
Defend a keep, revert, or stop decision using relevant measurements and preserved behavior.
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What this chapter teaches
Design for readability and correctness first; performance is a separate optimization phase you do later if needed.
structural choices influence which optimizations are available, but their cost depends on compiler decisions and workload. Interface dispatch may block inlining without allocating; value passing may avoid heap work while retaining copy cost; pointer-rich retained data may add GC scan work. Cost-aware design makes these choices for clear semantics, then tests performance claims with evidence.
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